Annual report pursuant to Section 13 and 15(d)

Stockholders' equity - Summary of equity-based compensation expense (Detail)

v3.22.2.2
Stockholders' equity - Summary of equity-based compensation expense (Detail)
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility, Minimum 122.10% 112.00%
Expected volatility, Maximum   127.40%
Expected term 6 years  
Risk-free interest rate, Minimum 1.36% 0.44%
Risk-free interest rate, Maximum   0.55%
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term   6 years
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term   3 years 6 months